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A181731 as a simple table

na(n)
11
21
31
41
52
62
71
86
914
104
111
1224
13222
14106
158
161
17120
186384
199918
20838
2116
221
23720
24291720
252306904
26486924
276802
2832
291
305040
3119445040
321085674320
33964948464
3425267236
3556190
3664
371
3840320
391781750880
40906140159280
414927561419120
42439331916888
431359631776
44470010
45128
461
47362880
48214899027840
491224777388630320
5054259623434853360

[1,1,1,1,2,2,1,6,14,4,1,24,222,106,8,1,120,6384,
 9918,838,16,1,720,291720,2306904,486924,6802,32,1,
 5040,19445040,1085674320,964948464,25267236,56190,
 64,1,40320,1781750880,906140159280,4927561419120,
 439331916888,1359631776,470010,128,1,362880,
 214899027840,1224777388630320,54259623434853360]